How to Register as Self-Employed with HMRC (Step by Step)

If you've started working for yourself — freelancing, contracting, selling online or running a small business — one of the first official things you must do is register as self-employed with HMRC. Miss the deadline and you can face penalties, so it pays to get it right early. This step-by-step guide explains exactly when to register, how to do it, and what happens afterwards.

Once you're registered, our UK Self-Employed Tax Calculator helps you estimate the tax you'll owe. First, let's get you registered.

When do you need to register as self-employed?

You need to register as self-employed with HMRC once your income from self-employment goes over £1,000 in a tax year. Below that, the trading allowance means you generally don't need to register or pay tax on it. Once you cross that threshold, you become responsible for reporting your income through Self Assessment.

The key point most people miss is the deadline: you must register by 5 October following the end of the tax year in which you started. For example, if you started trading in the 2025/26 tax year, you must register by 5 October 2026. Leaving it later risks a penalty, so register as soon as you know you'll cross the £1,000 threshold.

Step-by-step: how to register

Registering is done online through the official HMRC website. The process is straightforward:

• Step 1 — Go to the HMRC website and start the "register for Self Assessment" process as a sole trader.
• Step 2 — Create a Government Gateway account if you don't already have one. This is your login for all HMRC online services.
• Step 3 — Provide your personal details, the date you started trading, and the nature of your business.
• Step 4 — HMRC issues you a Unique Taxpayer Reference (UTR) by post, usually within about 10 working days. You need this to file your tax return.
• Step 5 — You'll also be enrolled to file Self Assessment online, with an activation code sent separately.

Because the UTR and activation code arrive by post, don't leave registration to the last minute — the paperwork takes time to arrive.

What happens after you register?

Once registered, you're in the Self Assessment system. Each year after the tax year ends on 5 April, you'll need to:

• File a Self Assessment tax return declaring your income and expenses.
• Pay any income tax and Class 4 National Insurance due by 31 January.
• Possibly make payments on account — advance instalments towards next year's bill, which we explain in our guide to payments on account.

To understand how your tax bill is actually calculated, read our guide on how much tax sole traders pay. It walks through income tax and National Insurance on your profits with worked examples.

Keep good records from day one

From the moment you register, start keeping records of all your income and business expenses. Because you're taxed on profit, every legitimate expense you record reduces your tax bill. Good record-keeping also makes your first Self Assessment far less stressful. A simple spreadsheet or accounting app is enough for most sole traders when starting out.

Do you also need to register for VAT?

Registering as self-employed is separate from VAT. You only need to register for VAT once your taxable turnover exceeds the VAT threshold (a much higher figure than the £1,000 self-employment threshold). Most people starting out don't need to worry about VAT initially — but keep an eye on your turnover as you grow.

Frequently asked questions

When do I need to register as self-employed?

Once your self-employment income exceeds £1,000 in a tax year. You must register with HMRC by 5 October following the end of that tax year, or you risk a penalty.

How do I register as self-employed with HMRC?

Register online via the HMRC website for Self Assessment as a sole trader. You'll set up a Government Gateway account, provide your details, and receive a Unique Taxpayer Reference (UTR) by post.

What is a UTR number?

A Unique Taxpayer Reference is a 10-digit number HMRC issues when you register. You need it to file your Self Assessment tax return. It usually arrives by post within about 10 working days of registering.

What is the deadline to register as self-employed?

5 October following the end of the tax year in which you started trading. Registering late can lead to penalties, so it's best to register as soon as you pass the £1,000 income threshold.

Do I need to register for VAT too?

Not usually when starting out. VAT registration is only required once your taxable turnover exceeds the VAT threshold, which is far higher than the £1,000 self-employment threshold.

This article was last reviewed for the 2025/26 tax year. Figures and thresholds are for guidance only — always check the latest rules on the official HMRC website.